My dad is severely vision impaired and I've come to realize how many challenges he faces using a tablet. Pop-ups and overlays destroy his ability to use the device, and he struggles to get through it all. His heyday has come and gone... the new flat design styles with buttons made of nothing but a subtle grey title are a nightmare for him. I prefer the subtle approach, but my views are changing now that I know how hard it is for him.
Don't forget the people like myself with learning disabilities that require tech to organize and communicate. If schools were more willing to accept students who needed to use technology rather than writing them off as lazy or 'slow' the world would be a better place.